<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        #dvv{
            width: 200px;
            height: 200px;
            background: red;
        }
    </style>
</head>
<body>
    <div id="dvv">
        <button onclick="btnshow()">关闭广告</button>
    </div>
    <script>
        var dva=document.getElementById('dvv')
        var bbn=document.getElementsByTagName('button')
          function btnshow() {
           
                 setInterval(()=>{
                       
                      dva.style.display='none'
                         
                 },3000)
          }
    </script>
</body>
</html>